Itinerary

Day 1
Arrive at 12.20 then get the train to Florence (your not missing much in Pisa, you will get to see the leaning tower on day 6)

Day 2-4
Explore Florence (Adventures? well check out 500 Touring Club, you can drive a vintage Fiat 500 round the Italian countryside (20 Euro taxi to meeting point from city centre), its a great day out.